Ever wondered how to transport firearms on domestic airlines? All commercial airlines flying domestically out of California will allow you to transport firearms provided you can legally posses the firearm at your destination and transport it in accordance with State Laws and their rule & regulations. The rules for transportation vary from airline to airline. All will require to declare it at check in, show that it is unloaded, and sign a "Declaration of unloaded firearm" to be attached to the firearm. The firearms must be in an approved lockable container.